Two vectors $\overrightarrow A $ and $\overrightarrow B $ are at right angles to each other, when
Two vectors $\overrightarrow A $ and $\overrightarrow B $ are at right angles to each other, when
$\overrightarrow A + \overrightarrow B = 0$
$\overrightarrow A - \overrightarrow B = 0$
$\overrightarrow A \times \overrightarrow B = 0$
$\overrightarrow A \,.\,\overrightarrow B = 0$
Two vectors $\overrightarrow A $ and $\overrightarrow B $ are at right angles to each other, when
$\vec A.\vec B = \,|\vec A|.|\vec B|.\cos \theta = \vec A.\vec B.\cos 90^\circ = 0$
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